Help!! I'm using a Mid 2012 MBP retina. for the past 2 years my write speeds has been consistently on 400MB/s via black magic test. but now it only have 100MB/s going down to 80MB/s. what should I do???? getting slower...

Question

Help!! I'm using a Mid 2012 MBP retina 2.3Ghz i7 with 8GB of ram 256SSD. for the past 2 years my write speeds has been consistently on 400MB/s and up via black magic test. but now it only have 100MB/s going down to 80MB/s. what should I do???? I have already cleaned and even restored my MBP still it's on 100MB/s. please help. I have to finish tasks on a timely manner.

Answer 1

No. This requires completely repartitioning the SSD. You can do that only by using the Network Recovery method or the method I outlined. My method preserves all your data and doesn't require doing a slow Network Recovery. But if you wish to do that instead. The purpose of the whole exercise is to "clean" the SSD of garbage collected during use that tends to cause the SSD to slow down as you've described.
Install OS X Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Security button. Set Zero Data - one-pass, click on the OK button. Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.